International Chemical Safety Cards

SODIUM THIOSULFATE ICSC: 1138
World Health Organization (WHO) International Labour Organization (ILO) United Nations Environmental Programme (UNEP) European Commission National Institute for Occupational Safety and Health (NIOSH)
Disodium thiosulfate
Thiosulfuric acid, disodium salt
Sodium hyposulfit
Na2O3S2
Molecular mass: 158.1
ICSC #    1138
CAS #     7772-98-7
RTECS # XN6476000
April 06, 2006 Validated
TYPES OF HAZARD/ EXPOSURE ACUTE HAZARDS/ SYMPTOMS PREVENTION FIRST AID/
FIRE FIGHTING
FIRE Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.
NO contact with oxidants
In case of fire in the surroundings: use appropriate extinguishing media.
EXPLOSION Risk of explosion on contact with oxidants


EXPOSURE


 •INHALATION
Avoid inhalation of dust
Fresh air, rest.
 •SKIN

Rinse and then wash skin with water and soap.
 •EYES Redness.
Safety goggles
First rinse with plenty of water (remove contact lenses if easily possible).
 •INGESTION
Do not eat, drink, or smoke during work.
Rinse mouth.
SPILLAGE DISPOSAL STORAGE PACKAGING & LABELLING
Personal protection: P1 filter respirator for inert particles. Sweep spilled substance into containers.
Separated from strong oxidants,

SEE IMPORTANT INFORMATION ON BACK
ICSC: 1138 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

International Chemical Safety Cards

SODIUM THIOSULFATE ICSC: 1138
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PHYSICAL STATE; APPEARANCE:
COLOURLESS CRYSTALS.

PHYSICAL DANGERS:


CHEMICAL DANGERS:
The substance decomposes on heating producing toxic fumes, including sulfur oxides . Reacts violently with strong oxidants.

OCCUPATIONAL EXPOSURE LIMITS:
TLV not established.
MAK not established.


ROUTES OF EXPOSURE:


INHALATION RISK:
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed

EFFECTS OF SHORT-TERM EXPOSURE:


EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
PHYSICAL
PROPERTIES
Decomposes below boiling point at 300C
Melting point: 48.5C
Density: 1.7
g/cm
Solubility in water, g/100 ml at 20C: 20.9
Vapour pressure, Pa at 20C: negligible
Octanol/water partition coefficient as log Pow: -4.35 (calculated)
ENVIRONMENTAL
DATA

N O T E S
ADDITIONAL INFORMATION


ICSC: 1138 SODIUM THIOSULFATE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.